Safety valve



. c. L. B sTlAN Filed Sept. '7. 1926 Watented or. l5,'1927.

r LES L. BASTIAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BASTIAN-BLESSING COMEANY, E CHICAGO, ILLINOIS, A CORPORATION OF ILLINQIS.

SAFETY VALVE.

Application filed September 7, 1926. Serial No. 133,796.

This invention relates to valves of the The safety device comprises va nipple 20 on kind which are used on the supply tanks or the valve body and it is provided with a cylindehs containing high pressure gas, and safety chamber 21 communicating by a pasits object is to provide such a valve with sage 22 with the gas passage 5. A cylinder novel and improved safety means of eflicient 23 open at one end and closed at the other 60 construction and operation and adapted to is arranged within the chamber 21 and is yield and release the gas when a predeter .held in place by a cap 24 screw threaded on mined pressure in the tank is exceeded. the nipple and having one or more air In the accompanying drawings illustratpassages through which atmospheric 1 ing a selected embodiment of the invention: pressure is constantly admitted to the inte- Fig. 1 is a sectional view of the valve. rior of the cylinder. I prefer to provide a Fig. 2 is a perspective view of the safety head 26 for the cylinder having a passage 27 device. therein and a boss 28 on which the open I have shown the invention embodied in end of the cylinder is mounted. A washer I a valve like that covered by my applib ation 30 is arranged between the head and the nip- Serial No. 133,795 filed concurrently herepic 20 and a washer 31 is seated in the head with and comprising a body 3 having a to be engaged on the cap whereby the cylinthreaded .end 4 adapted to be screwed into der maybe clamped tightly against the nipthe tank and provided with a gas passage 5 plc to support the cylinder in the chamber 2 extending through the seat 6 and communi- 21 free from contact with the wall thereof. eating with the valve chamber 7. A thread- The exterior of the cylinder is exposed to ed nipple 8 is'adapted tobe connected with the pressure in the tank while the interior of means for charging or discharging the tank the cylinder is exposed to atmospheric presand this nipple is providedwith a passage sure. Whenever the-tank pressure exceeds 2 9 which communicates with the valve chamthe resistance of the cylinder the latter will her 7 Zi'valve member 10 is arranged in the collapse and shear on the edge of the boss 28 valve chamber 7 and it carries a valve disk to permit the gas to escape from the tank.

11 which engages the seat 6. A diaphragm I'prefer to thin the wallet the cylinder at 12 is clamped gas tight on the valve mem the edge'of the bossby reducing the exterior her and ,its margin is clamped gas tight diameter or increasing the interior diameter 35 against a shoulder 13 on the body by a plug of the cylinder, but this thinning may be 14 which is screw threaded in a recess 15 in done in other ways. the body. A hand wheel 16 has a stem 17 Heretofore disks have been employed as a which is screw threaded in the opening 18 safety means, but their eficienc depends 35 in the plug and this stem-has a head and upon the texture and hardness o the metal slot connection 19 with the valve member and they deteriorate under continued pres. whereby the hand wheel and stem may have sure. For this and other reasons it is not conjoint movement with the valve member practicable to provide a disk which will not longitudinally ,but independent movement fracture somewhere in a range of 30.0 or 400 4 rotatively. In this particular valve the disk pounds. The cylinder is a great improve- 95. is moved to and from the seat by direct acment upon the disk because the cylinder is tion of the hand wheel and the sole function not aiiected like the disk by continued pres- I of the diaphragm is to provide a gas tight sure since there is no tendency of the metal A closure for the upper ends of the valve of the cylinder to stretch, as there is in the 45 chamber. Y disk; and the cylinder can be formed to. had 10 i have chosenthis valve because of its ture within a much smaller range of pres eficiency vand simplicity, to illustrate the sure than a disk. Practical tests have shown present invention of the ,safety means, but that with the cylinder the range of fracture I do not thereby limit'or restrict this incan be easily held within pounds. The

5 vention to use with a valve of the particular cylinder thus provides an eflicientsafety deconstruction shownand described for it will vice which is superior-to those now being be readily understood that'the safety means used and therefore it makes these high presmay be embodied with equally satisfactory sure gas tanks safe to handle under all temresults in valves constructed difierently from perature conditions.

5 the one'shown. Changes may be made in the to, con-" struction and arrangement of the invention of the safety means to adapt it for valves of difi'erent kinds, and for other purposes, and I reserve the right to make all such changes as fairly fall within the scope of the following claims.

I claim: I

1. A gas valve comprising a body having a chamber therein in communication with the gas supply, and a cylindrical member supported withinthe chamber and exposed exteriorly to the gas pressure and interiorly to atmospheric pressure, the wall of said memberbeing adapted to fracture under excessive gas pressure to permit escape of the as. g 2. A gas valve comprising a body having a chamber therein in communication with the gas supply, a cylinder open at one end and closed at the other end, and means supporting the cylinder in the chamber and com rising a boss entered into the open end of t e c linder, said cylinder being exposed exterior y to the gas pressure and interiorly to atmospheric pressure, the wall of the cylinder being adapted to collapse and shear on the edge of the boss under excessive gas pressure to permit escape of the gas.

3. A as valve comprising a body having a cham er therein in communication with the gas supply, a cylinder open at one end and closed at the other end, and means supporting the cylinder in the chamber and comprising a head, a boss in the head entered into the open end of the cylinder, and a cap engaged with the body and clamping the head against the body, said cap and head and boss having passages therein admitting atmospheric air to the cylinder, the wall of the cylinder being adapted to collapse and shear on the edge of the boss under excessive gas pressure to permit escape of the gas.

4. A gas valve comprising a body having a chamber therein in communication with the gas supply, and a cylindrical member supported within the chamber and exposed exteriorly to the gas pressure and interiorly to atmospheric pressure, the said wall having a thinned section adapted to fracture under excessive gas pressure to permit escape of the gas.

5. A gas valve comprising a body having a chamber therein in communication with the gas supply a cylinder open at one end and closed at the other end, and means supcylinder in the chamber and comprising a boss entered into the open end of the cylinder, said cylinder being exposed extcriorly to the gas pressure and interiorly to atmo pheric pressure, the wall of the cylinder being thinned at the end of the boss and adapted to collapm and shear on the edge of the boss under excessive gas pressure to permit the escape of the gas.

CHARLES L. BASTIAN.

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